This story is like so many other global warming stories. How can it imply that Carbon Dioxide is the main greenhouse gas? It's time to stop getting our education from the media and do a little research ourselves. A simple internet search on "composition of the earths atmosphere" certainly does not bode well for the global warming crowd. Could it be that the democrats hate big business so much that they would target something like carbon dioxide to shut down steel mills, harm the oil and gas industry, even find new ways to levy a tax. Sure, science shows that the earth is warming, and it shows it just came through a cooling stage (also found on the internet). Could some Governor in the mid-west want ethanol to sustain his state that he is willing to push the charge against oil companies? Could the Chinese want to import steel to a point that they spend a few million dollars in the right pockets to lead a charge against the U.S. steel market? Lets stop taking things as fact just because a talking head said it, use the internet to verify the facts.